High Vacuum & high Temperature

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This test device was developed to determine friction factors under vacuum/high vacuum and high temperature conditions up to 700°C for lifetime tests and benchmarking of different materials. The sample temperature is measured on-line, the torque measurement is done punctual (individual interval 10 <> 120 s) using following method: the rotation is done CW and CCW for a defined number of rotations, then a difference measurement is done. This is necessary for piezo sensors which are not usable for on-line measurement due drifting of the signal. Post-Analysis may cover measurement of wear by topographic means. Investigation of surface morphology or material transfer is possible using SEM/EDX. Changes in the subsurface microstructure can be analysed locally resolved by EBSD (Electron Back Scattering Diffraction). The device is fully PC-controlled. On-line-data acquisition offers to post-process data, e.g. for automatic calculation of friction coefficients in running-in or steady state, as well as benchmark of different materials under high vacuum and high temperature conditions.

Measurement of

Friction force / coefficient (punctual, individual interval
10 <> 120 s)

  • Temperature (on-line)
  • Wear (geometric or mass loss)

hvt_1Geometry: cone-disk-on-ring

htv_2Geometry: pin-on-disk

hvt_3Mounted setup with inductive heating

hvt_4Full test setup

Test Measurement of

  • Friction force / coefficient (punctual, defined interval 10 <> 120 s)
  • Temperature (on-line)
  • Wear (geometric or mass loss)
Temperature from RT up to + 700 °C
Load (contact pressure) 3 to 30 N (50kPa <> 300kPa for Cone-ring-on-disk, higher hertzian pressure up to MPa range possible depending on radius of pin-on-disk)
Speed / Motion 0.001 <> 0.2 m/s (1 <> 150 rpm)
Environments Vacuum to high vacuum (10^3 <> 10^5 mbar depending on outgassing behaviour of sample)
Samples Cone-ring-on-disk, pin-on-disk
Accuracy Torque 10 Nm max (piezo) Sample temperature ±
10 °C Load ± 0.1 N